B&P Lamp 2 5/8 x 13 Twist-Lock chimney - Twist-Lock Chimney is designed to fit ALADDIN brand burners models 7-12, A, B, C, 21, 21C, and 23. Also fits B and P replacement burners, Measures 2 5/8 inch fitter by 13 inch height and 3 inch bulge, with locking base.